Ballast: All ballasts are 100% factory tested. HPS: 120V is reactor normal-power factor standard (XHP available). 208V, 240V, 347V, 480V, and TB are high reactance, high power factor standard. MH: High reactance high power factor for 150W and below. Constant wattage autotransformer for 175M. 150W and below are standard with pulse-start ignitor technology. CSA, NOM or INTL required for probe start shipments outside the U.S. for 175M. Not available 175M SCWA. Compact fluorescent uses an electronic high-frequency ballast.